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Rozhen Night Plan

Up to ten targets, one night: each gets its good/marginal/poor windows (darkness × altitude × Moon × clouds, as on the single-target page), then the night is handed out five minutes at a time to whichever target is best — with hysteresis, so you get a few solid blocks of at least 30 minutes, not a flicker. Targets that never win a block are listed with the reason.

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Night of Monday, 20 July 2026 · astronomical night 22:50 → 04:04 (5.22 h) · Moon 45% (waxing crescent) · weather: ERA5 history

M31M31 23:35–23:40: quality 0.2M31 23:40–00:00: quality 0.3M31 02:00–02:50: quality 0.7M31 02:50–04:00: quality 0.8M31 04:00–04:05: quality 1.0M31 04:05–04:55: quality 0.5M31 04:55–05:35: quality 0.2observe M31 02:30–03:30M42M45M45 03:40–04:00: quality 0.4M45 04:00–04:05: quality 0.6M45 04:05–04:20: quality 0.3M45 04:20–04:55: quality 0.4M45 04:55–05:35: quality 0.1observe M45 04:30–04:55NGC 7000NGC 7000 21:25–22:05: quality 0.1NGC 7000 22:05–22:55: quality 0.4NGC 7000 22:55–23:00: quality 0.9NGC 7000 23:00–23:40: quality 0.5NGC 7000 23:40–00:00: quality 0.6NGC 7000 02:00–04:00: quality 0.8NGC 7000 04:00–04:05: quality 1.0NGC 7000 04:05–04:55: quality 0.5NGC 7000 04:55–05:15: quality 0.2NGC 7000 05:15–05:35: quality 0.1observe NGC 7000 22:05–23:05V1057 CygV1057 Cyg 21:25–22:05: quality 0.1V1057 Cyg 22:05–22:55: quality 0.4V1057 Cyg 22:55–23:00: quality 0.9V1057 Cyg 23:00–23:40: quality 0.5V1057 Cyg 23:40–00:00: quality 0.6V1057 Cyg 02:00–04:00: quality 0.8V1057 Cyg 04:00–04:05: quality 1.0V1057 Cyg 04:05–04:55: quality 0.5V1057 Cyg 04:55–05:15: quality 0.2V1057 Cyg 05:15–05:35: quality 0.1observe V1057 Cyg 23:05–00:00observe V1057 Cyg 02:00–02:30M33M33 02:00–02:20: quality 0.6M33 02:20–03:15: quality 0.7M33 03:15–04:00: quality 0.8M33 04:00–04:05: quality 0.9M33 04:05–04:55: quality 0.5M33 04:55–05:35: quality 0.2observe M33 03:30–04:30scheduleNGC 7000V1057 CygV1057 CygM31M3322:0000:0002:0004:0006:00

Each row is the target's quality through the night, white → amber → green for 0 → 0.3 → 0.6 → 1 (the same thresholds as poor / marginal / good). Dark blue: the schedule. Grey columns: twilight.  Download: schedule CSV · targets CSV · JSON

Schedule

localtargethoursmean quality
20:50–22:05 — nothing worth pointing at — 1.25
22:05–23:05 NGC 7000 1.0 0.47
23:05–00:00 V1057 Cyg 0.92 0.55
00:00–02:00 — nothing worth pointing at — 2.0
02:00–02:30 V1057 Cyg 0.5 0.79
02:30–03:30 M31 1.0 0.79
03:30–04:30 M33 1.0 0.67
04:30–04:55 M45 0.42 0.4
04:55–06:05 — nothing worth pointing at — 1.17

Targets

targetastronomyoverallbest windowhighestMoon sep.scheduled h
M31 Andromeda Galaxy 100 53 02:00–04:05 (good) 89.7° at 06:10 150.3° 1.0
M42 Great Orion Nebula 0 0 — 42.9° at 11:00 113.1° 0.0
M45 Seven Sisters 8 8 03:40–04:55 (marginal) 72.5° at 09:15 142.5° 0.42
NGC 7000 North America Nebula 100 54 02:00–04:05 (good) 87.3° at 02:25 117.0° 1.0
V1057 Cyg 100 54 02:00–04:05 (good) 87.3° at 02:25 117.1° 1.42
M33 Triangulum Pinwheel 68 48 02:00–04:05 (good) 79.1° at 07:00 161.3° 1.0

Left out

💡 API 
curl -sS "https://devops.majbase.com/rozhen-planner/plan-api?targets=M31,M42,M45,NGC%207000&date=2026-07-20"

targets: names or RA Dec, separated by commas, semicolons or newlines, at most ten. The response carries targets[] (score, verdict, best_window, windows, transit, moon_separation), schedule[] (blocks with target, start/end in UTC and local, hours, mean_quality; target: null is idle time), unscheduled[] with a why, forecast_source, warnings[]. Missing targets → 400 {"error", "code": "targets_missing"}; an unreadable date → 400 {"error", "code": "invalid_date"}.